Trig 3D

///////////////////////////////////////////////////////////////
// trig-3d
// Use a 2D sine field to displace cube instances along the Z axis.
///////////////////////////////////////////////////////////////

&time = mlt(step, 0.003); // scale step into a slower time value
&dim = (64,64,1); // 64 × 64 2D field

#A{
   dim = &dim;
   run = 
   sin(
     mlt(
        // offset phase by distance from the origin
        add(&time, dst(C, 0)), 
        8 // spatial frequency
      )
   );
}

~A {
   dim = &dim;
   col = 
   mix(
      (0.4, 0.2, 0.1), // red
      (0.1, 0.4, 0.4), // teal
      #A // use field value as mix factor
   );
   rot = (HALF_PI, 0, 0);
   shape = CUBE;
   // use field value to displace each instance along Z
   i_pos  = (C.x, C.y, mlt(#A, 0.1)); 
}